You will get this notice when you try to load the user from the store like this
api.container.lookup('service:store').find('user', api.getCurrentUser().username).then((user) => {
});
Hydrating the user form the store apparently access the timezone on the user, triggering this notice.
I use the above code to access the user’s user_fields which are not populated on the user returned by api.getCurrentUser().
Is there a different way to get the user_fields from a theme or theme component without the above construction?